BioSc 231 General Genetics Exam 3 Name Multiple Choice 2 points each Recombination frequencies A are the same for all genes B arise from specific genetic exchange C are the same for cis and trans heterozygotes D decrease with distance A plant of genotype C d C d is crossed to c D c D and an F1 testcrossed to c d c d If the genes are linked and 40 map units apart the percentage of C d c d offspring will be A 10 B 20 C 30 D 40 E 50 When an organism gains or loses one of more chromosomes but not a complete haploid set the conditions is known as A polyploidy B euploidy C aneuploidy D triploidy E trisomy When an allotetraploid is backcrossed to one of its progenitor species a sterile progeny is produced The genomic composition of this sterile individual can be best represented by A n1 n2 B 2n1 2n2 C 2n1 D 2n2 E 2n1 n2 In Drosophila the two genes w and sn are X linked and 25 map units apart A female fly of genotype w sn w sn is crossed to a male from a wild type line What percentage of male progeny will be w sn A 0 B 12 5 C 25 D 37 5 E 50 It was once thought that the karyotype was related to criminal disposition because it led to aggressive behavior due to excessive maleness A XO B XY C XXY D XYY E YY Polyploid plants found in nature usually have even numbers of chromosomes because organisms having odd numbers A exhibit altered mitosis B are unable to asexually reproduce C exhibit altered growth D have low fertility E are not viable Out of 800 progeny of a three point testcross there were 12 double crossover recombinants whereas 20 had been expected on the basis of no interference The interference is A 0 05 B 0 10 C 0 20 D 0 30 E 0 40 In a cross of two yeast strains of genotypes c a X c a the progeny were 36 c a 40 c a 11c a 13 c a The frequency of recombination is A 11 B 12 C 24 D 50 E 76 Two genes with a 50 recombination frequency are A Present on homologous chromosomes B Located close to each other C Linked D Far apart on a single chromosome In testcross experiments the frequency of recombination between genes a and d is 0 3 between d and c 0 2 between c and b 0 1 between a and c 0 5 and between b and d 0 3 What is the order of the three genes A c b d a B d c a b C a d c b D b a c d E a b c d Euploidy is A a chromosome number that is not an exact multiple of the haploid number B an example of aneuploidy C a chromosome number that is an exact multiple of the haploid number D the addition of an extra copy of a particular chromosome E the absence of a particular copy of a chromosome Calico cats have a patchwork pattern of yellow and black spots This pattern is an example of A somatic mutation B dosage compensation C mitotic segregation D all heterozygotes display this phenomenon regardless of sex E X inactivation Consider a species with a diploid 2n number of 20 chromosomes How many chromosomes would be found in a trisomic body cell A 9 B 10 C 11 D 20 E 21 The basic diploid chromosome number in Poinsettia is 16 A new species of Poinsettia is found that has four complete sets of the chromosomes found in the 16 chromosome species 32 chromosomes total This species is said to be A haploid B diploid C triploid D tetraploid E pentaploid Consider a species with a diploid 2n number of 40 chromosomes How many chromosomes would be found in a monoploid body cell A 10 B 20 C 21 D 19 E 40 Three point test crosses A Detect double crossing over events B Require all heterozygous gametes C Cannot determine gene order on a chromosome D Determine goodness of fit Genes ho and dp are 10 map units apart and genes dp and da are 23 map units apart What is the probability of a double crossover in these regions A 1 3 B 2 3 C 3 4 D 4 5 E 5 6 In Drosophila the genes r and s are linked Flies of genotype r s r s and r s r s are crossed and an F1 obtained The F1 allele arrangement is called A cis B trans C recombinant D complementary The Drosophila genes for white eyes w tan body t and vestigial wings vg lie at map positions 2 12 and 42 respectively Out of 1000 progeny 21 exhibited double crossovers What is the degree of interference A 0 10 B 0 20 C 0 30 D 0 40 One Drosophila genotype P m P m is crossed with another genotype p m p m If the genes are closely linked A All progeny will be phenotypically Pm B All progeny will be phenotypically pm C 50 of the progeny will be phenotypically Pm and 50 phenotypically pm D None of the above A plant of genotype C D C D is crossed to c d c d and an F1 testcrossed to c d c d If the genes are unlinked the percentage of c d c d recombinants will be A 10 B 25 C 30 D 40 E 50 How many different trisomics could be formed in a plant with a diploid number of 10 A 9 B 10 C 11 D 20 E 40 Which of the following statements is true regarding recombination between genes on homologous chromosomes A Equivalent ratios 1 1 1 1 are found in progeny from homozygous dihybrid crosses B Recombination frequencies are greater than 50 C 25 of each genotype will appear among the progeny from dihybrid crosses D Exchange of the middle pair of alleles occurs in double crossovers Problems variable points each Two point testcrosses revealed the following map results am pm 17 map units pm nn 11 map units A Draw the two possible maps for these loci 2 B What cross would resolve the two possible maps and what are the possible outcomes of that cross 1 Consider a fully heterozygous flowering plant with normal blue flowers and round seeds This plant when crossed with one that has red flowers and oval seeds results in the following progeny 91 blue round 92 red round 93 blue oval 94 red oval A What is the recombination frequency 1 B Are these genes linked 1 What gametes are produced by an individual with the genotype k L K l if the genes are A linked no crossing over and B unlinked 2 Several testcrosses have revealed the rate of recombination for the following genes k m 0 06 k l 0 08 l m 0 13 What is the …